@memory

i have the same problem. but i fix it it seems that the second card is not really available for this tool after a fresh reboot.

my solution:

After fresh reboot i run a short 3dmark scene. 3dmark03 nature is good for 5 seconds.
then the oc tool work and let me oc the second card





i don´t know why the second card is not avaiable after a fresh reboot. any idea for this??

Windows XP SP2